What are Helical Tieback Anchors?

Helical tieback anchors are used to provide support or reinforcement to foundation walls or structures that have shifted and settled, or failed due changes in the soil. They are also used in tieback construction to support retaining walls, large towers, seawalls, dams and levees.

Helical tieback anchors are called such because of their ability to anchor into loose, sandy or low strength, clay soils. The anchors are made from galvanized steel to ensure they don’t corrode when exposed to the elements, such as moisture or soil. They require minimal equipment or time to install, and can be used in limited access areas.

How do they work?

Helical tieback anchors are mechanically screwed into the soil with a rotary drill. The anchors act as a bearing, or support device, and are not dependent on soil and grout friction because they actually bypass the problem or unstable soil. In order to provide the best support, they are usually installed at an angle to the structure they are shoring up. The angular installation helps to cancel out hydrostatic pressure that is causing or may cause the structure to bulge or rotate inward.

Once the helical tieback anchor is installed, it is tested to ensure it is providing the necessary strength needed. After the strength has been evaluated the anchor is attached to the interior wall to help apply tension to the structure and prevent further or future bulging. Installation usually takes less than an hour and the anchors can be withdrawn or re-used at anytime.

What are their applications?

As we mentioned above, helical tieback anchors are used to support or reinforce structures, such as basement walls, retaining walls, dams, revetments, and boardwalks and bridge abutments. They are commonly used in place of other solutions because they are Eco-friendly, cost effective, and can be installed quickly, no matter the weather or time of year.

Additionally, they have a long life span, are extremely flexible to changing soil conditions, and can be proof and tension loading tested. Plus, helical tieback anchors can be removed or stored for use in future projects.